Question about operators.

The description that they give there is I believe got a mistake (I just don't know what mistake).

The only one that may not be known by you is the module, specified with the percentage sign (%). Module is the operation that gives the rest of a division of two integer values. For example, if we write a = 11 % 3;, the variable a will contain 2 as result since 2 is the rest from dividing 11 between 3.

If you are doing normal devision using a paper and a pencil... You'll get two things:
The result, and the remainder...
The / operator will give you the result, and the & operator will give you the remainder.